| Jedd O'Keeffe Racing Ltd | Agriculture & fishing | 2015 |
| Jeremy Moon Decorator and Paperhanger Ltd | Construction | 2014 |
| JH Solutions Limited | Manufacturing | 2021 |
| JIM Thompson Transport Ltd. | Other services | 2012 |
| Jjwt Limited | Wholesale & retail | 2017 |
| Johanica Ltd | Hospitality | 2022 |
| Johnson Craib Ltd | Hospitality | 2025 |
| Jonicat Ltd | Real estate | 2012 |
| Jordan Eaton Ltd | Professional & scientific | 2023 |
| Julian R Holmes Limited | Construction | 2012 |
| JWA International Refrigeration Ltd | Transport & logistics | 2025 |
| K & D Rentals North Yorkshire Ltd | Real estate | 2025 |
| K Calvert Ltd | Agriculture & fishing | 2011 |
| K W Bulk Services Limited | Transport & logistics | 2004 |
| Karl Longden Plumbing Ltd | Construction | 2019 |
| Keenan Consultancy Ltd | Professional & scientific | 2016 |
| Keith Battersby Joinery Limited | Construction | 2011 |
| Kewkii Limited | Information & communication | 2016 |
| Kiplin Country Park Limited | Hospitality | 2025 |
| L & L Building Services (North East) Ltd | Construction | 2017 |
| L Davison Plumbing & Heating Ltd | Construction | 2025 |
| Leadership and Personal Excellence Ltd | Professional & scientific | 2016 |
| Leatham Family Investment Company Ltd | Financial services | 2024 |
| Leyburn Cafe Ltd | Hospitality | 2025 |
| Leyburn Community Leisure & Squash Club CIC | Arts & recreation | 2023 |
| Leyburn Dental Practice Ltd | Health & social care | 2012 |
| Leyburn Health Clinic Limited | Health & social care | 2024 |
| Leyburn Laundry Ltd | Other services | 2020 |
| Libra Consulting Limited | Professional & scientific | 1994 |
| Light-Tech Electrical Ltd | Construction | 2013 |
| Lily Leatham Ltd | Wholesale & retail | 2025 |
| Lionhouse Services Ltd | Information & communication | 2006 |
| Little Berries Childcare Ltd | Health & social care | 2025 |
| Livetrack Holdings Ltd | Wholesale & retail | 2021 |
| Logic Health Consulting Ltd | Health & social care | 2017 |
| Long Close Holdings Limited | Professional & scientific | 2023 |
| Longden and Metcalfe Developments Ltd | Real estate | 2023 |
| Longden Developments Limited | Real estate | 2026 |
| Lords Bakery Ltd | Hospitality | 2024 |
| LOW Lane Christmas Trees Ltd | Wholesale & retail | 2012 |
| Lower Dales Development Limited | Construction | 2025 |
| Lowmill Building & Landscaping Ltd | Construction | 2016 |
| Lunar Mining Company Ltd | Mining & quarrying | 2021 |
| Lyons Music Publishing Ltd | Information & communication | 2019 |
| M B Game Consultancy Limited | Agriculture & fishing | 2003 |
| M Russell Consultancy Ltd | Professional & scientific | 2022 |
| Manor Farm Barns Burrill Ltd | Households | 2024 |
| Mark R. Stephenson (Electrical) Limited | Construction | 2003 |
| MC Services 2022 Limited | Information & communication | 2022 |
| Mcintyre Meats Limited | Real estate | 2001 |
| Melbeck Properties Limited | Real estate | 2021 |
| Melmerby Water Trust Limited | Water & waste | 2004 |
| Metcalfe Estates Ltd | Real estate | 2024 |
| Metcalfe Farms (Contracting) Ltd | Agriculture & fishing | 2019 |
| Metcalfe Farms (Holdings) Ltd | Financial services | 2019 |
| Metcalfe Farms Ltd | Mining & quarrying | 2022 |
| Metcalfe Haulage Ltd | Extraterritorial | 2024 |
| Metcalfe Projects Ltd | Construction | 2022 |
| MGY Construction Ltd | Construction | 2024 |
| Miad Limited | Wholesale & retail | 1984 |
| Michael Mcbride Limited | Hospitality | 2019 |
| Middleham Key Centre Limited | Education | 1996 |
| Middleham Motors Ltd | Wholesale & retail | 2015 |
| Middleton Livestock Ltd | Agriculture & fishing | 2025 |
| Mill Race Teashop Limited | Hospitality | 2016 |
| ML Sports and Fitness Ltd | Arts & recreation | 2016 |
| ML Sports Coaching Limited | Arts & recreation | 2018 |
| Montpellier Events Ltd | Administrative & support | 2010 |
| Movecompare Ltd | Information & communication | 2020 |
| MSR Property Ltd | Real estate | 2016 |
| Muker Show Limited | Professional & scientific | 2009 |
| Mwave Solutions Limited | Professional & scientific | 2017 |
| N4 Property Investments Limited | Construction | 2024 |
| NEH Joinery Limited | Construction | 2009 |
| News Today Limited | Information & communication | 2015 |
| NH Flooring (Yorkshire) Ltd | Construction | 2010 |
| Niad Developments Limited | Real estate | 2003 |
| NIW Associates Ltd | Professional & scientific | 2025 |
| NJC (Yorkshire) Ltd | Construction | 2011 |
| Norman Iveson Steel Products Limited | Manufacturing | 1984 |
| Normanby Investments Limited | Real estate | 2015 |
| Northern Forestry Ltd | Agriculture & fishing | 2024 |
| Northern Form Limited | Professional & scientific | 2025 |
| Northern Group Holdings Limited | Professional & scientific | 2021 |
| Northern Readymix Ltd | Manufacturing | 2019 |
| Northern Tanks Limited | Manufacturing | 2021 |
| Northlawn Limited | Hospitality | 2003 |
| Novercia Consulting Ltd | Administrative & support | 2024 |
| Nuvech Solutions Ltd | Manufacturing | 2017 |
| Oakwood Stables Limited | Arts & recreation | 2021 |
| One Call Care Solutions Limited | Health & social care | 2010 |
| Opulent Lets Limited | Real estate | 2017 |
| Ostara Insights Ltd | Professional & scientific | 2024 |
| Outhwaites Limited | Extraterritorial | 2009 |
| P a Blackburn Limited | Wholesale & retail | 2005 |
| P Spensley Plumbing & Heating Ltd | Construction | 2003 |
| P T Arnold Construction Ltd | Construction | 2012 |
| P W Computers Limited | Information & communication | 1995 |
| Paddy Neville Racing Ltd | Arts & recreation | 2023 |
| Pagoda Training Limited | Information & communication | 1995 |